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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d5ac31239a402d8d4f339a5b0755e13b2b9b1e044f1272829a6f0c7deccb13' 
  AND token = 'U2H/rOfeGo2mTKlbgR8K9c2as6pHmZD9OzChcp9pKl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}